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Applied Optics

Applied Optics


  • Vol. 37, Iss. 28 — Oct. 1, 1998
  • pp: 6677–6683

Two-color mid-infrared thermometer with a hollow glass optical fiber

Ward Small, IV, Peter M. Celliers, Luiz B. Da Silva, Dennis L. Matthews, and Barbara A. Soltz  »View Author Affiliations

Applied Optics, Vol. 37, Issue 28, pp. 6677-6683 (1998)

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We have developed a low-temperature optical-fiber-based two-color infrared thermometer. A single 700-μm-bore hollow glass optical fiber collects and transmits radiation that is then modulated and split into two paths by a reflective optical chopper. Two different thermoelectrically cooled mid-infrared HgCdZnTe photoconductors monitor the chopped signals that are recovered with lock-in amplification. With the two previously obtained blackbody calibration equations, a computer algorithm calculates the true temperature and emissivity of a target in real time, taking into account reflection of the ambient radiation field from the target surface. The small numerical aperture of the hollow glass fiber and the fast response of the detectors, together with the two-color principle, permit high spatial and temporal resolution while allowing the user to dynamically alter the fiber-to-target distance.

© 1998 Optical Society of America

OCIS Codes
(040.3060) Detectors : Infrared
(060.2390) Fiber optics and optical communications : Fiber optics, infrared
(170.4580) Medical optics and biotechnology : Optical diagnostics for medicine
(230.4040) Optical devices : Mirrors
(230.5160) Optical devices : Photodetectors
(260.3090) Physical optics : Infrared, far

Original Manuscript: March 12, 1998
Revised Manuscript: June 22, 1998
Published: October 1, 1998

Ward Small, Peter M. Celliers, Luiz B. Da Silva, Dennis L. Matthews, and Barbara A. Soltz, "Two-color mid-infrared thermometer with a hollow glass optical fiber," Appl. Opt. 37, 6677-6683 (1998)

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